Question: What is worked  of grandchildren of Jan Smets ?
Paraphrase: What is Jan Smets's grandchildren's works?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q19334606 wdt:P1038 ?X . ?X wdt:P108 ?answer}
Answer: European Central Bank, Bank for International Settlements, Katholieke Universiteit Leuven, University of Groningen, Ghent University